What is Doman name

Any website name like Facebook ,google ,yahoo has specific ip. (internet protocol)

And work on ip one computer is connected to other computer

And ip is difficult to remember by human

Human essly remember name instead of number

So every ip has a specific name known as domain

And any domain name registration company like " GoDaddy.com" provide your domain by which  people rich at your website

Just like my website domain name is digitalsupports and my url is Http://www.digitalsupports.in  that is type of .in(India) Reginal domain

Other type domains are
.in (India)
.UK (united Kingdom)
.us (united states America)
.com (commercial)
.org (organisation)
.edu (educational)
.gov (government)
.gov.in(indian government)
Etc